* {
    margin: 0;
    padding: 0;
}
body {
    background-color: slategrey;
    font-family: 'Microsoft yahei';
    font-size: 14px;
}
li {
    list-style: none;
}
a {
    text-decoration: none;
}
.w {
    margin: auto;
    width: 1000px;
    background-color: aliceblue;
}
.clearfix:after {
    content: "";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
}
.clearfix { /* IE6, 7专有 */
   *zoom: 1;
}
.header {
    height: 35px;
    margin: 20px auto;
}
.header .nav {
    height: 35px;
}
.header .logo {
    float: left;
    width: 150px;
    height: 35px;
    background-color: darkgrey;
    /* background-image: url(../images/png/aichong01.png); */
    background-repeat: no-repeat;
    margin-right: 20px;
}
.header .nav a {
    float: left;
    height: 35px;
    background-color: darkgrey;
    padding: 0 15px;
    font-size: 15px;
    line-height: 35px;
}
.header .nav a:hover {
    color: blue;
    border-bottom: 2px solid blue;
}
.header .nav .search {
    float: right;
    width: 250px;
    background-color: darkgrey;
    margin-right: 20px;
    border-collapse: collapse;
}
.header .nav .search input {
    float: left;
    height: 33px;
    border: 1px solid blue;
    padding-left: 20px;
}
.header .nav .search input:focus {
    box-shadow: 5px 5px 10px rgba(0, 0, 0, .3);
}
.header .nav .search button {
    float: left;
    width: 40px;
    height: 35px;
    border: 0;
    background-color: blue;
    color: white;
}
.header .nav .person {
    float: right;
    width: 50px;
    height: 35px;
    background-color: darkgrey;
    background-image: url(../images/png/8.png);
    background-repeat: no-repeat;
    background-position: left center;
    line-height: 35px;
    padding-left: 50px;
}
.menubox {
    height: 450px;
    background-color: antiquewhite;
}
.menubox .menu {
    height: 450px;
}
.menubox .menu .left {
    float: left;
    width: 150px;
    height: 450px;
    background-color: silver;
}
.menubox .menu .left ul li {
    display: block;
    width: 130px;
    padding: 15px 0 12.7px 20px;
    background-color: rgba(21, 7, 76, .9);
    font-size: 13px;
}
.menubox .menu .left ul li a {
    color: white;
}
.menubox .menu .left ul li a span {
    float: right;
    margin-right: 10px;
    color: white;
}
.menubox .menu .left ul li:hover {
    background-color: rgb(21, 7, 76);
}
.menubox .menu .right {
    float: left;
    width: 850px;
    height: 450px;
    background-color: azure;
}
.menubox .menu .right .course {
    float: right;
    width: 150px;
    height: 250px;
    margin-top: 50px;
    background-color: teal;
}
.title {
    height: 20px;
    background-color: white;
    margin: 10px auto;
    line-height: 20px;
    box-shadow: 5px 5px 5px rgba(0, 0, 0, .3);
}
.title h3 {
    float: left;
    padding: 0 50px;
}
.title ul {
    float: left;
}
.title ul li {
    float: left;
    padding: 0 20px;
    border-left: 2px solid blue;
    text-align: center;
    font-size: 12px;
}
.title ul li a:hover{
    color: blue;
}
.title ul>.lastli {
    border-right: 2px solid blue;
}
.title>a {
    float: right;
    margin-right: 50px;
    color: blue;
    font-size: 12px;
}
.box {
    height: 30px;
    line-height: 30px;
}
.box h3 {
    float: left;
    padding-left: 30px;
    background-color: violet;
    font-weight: 400;
}
.box a {
    float: right;
    padding-right: 30px;
    background-color: violet;
    color: blue;
}
.content {
    background-color: darkgray;
}
.content ul>li {
    float: left;
    position: relative;
    width: 190px;
    height: 250px;
    margin: 5px 5px;
    background-color: skyblue;
}
.content ul>li .hot {
    position: absolute;
    right: -5px;
    width: 50px;
    height: 20px;
    background-color: rebeccapurple;
    color: white;
    font-weight: 700;
    text-align: center;
}
.footer {
    height: 200px;
    background-color: wheat;
    overflow: hidden;
}
.footer .w {
    height: 200px;
    margin-top: 20px;
}
.footer .w dl {
    float: right;
}